Advanced Materials for Optics and Electronics · 1998 · 26 citations · 0 references
Natural SciencesChemistryMaterials ScienceCatalysisSurface ChemistrySurface ScienceCatalyst CharacterizationCatalyst StabilityCatalytic MaterialsSurface CatalysisSurface ReactionsSurface ReactivityCatalyst Surface EngineeringCatalyst Surface StructureCatalyst SurfacesCatalytic ActivityHydrogenationHydrogenation CatalysisPlatinum CompoundsSurface Sensitivity
The chemical and structural surface-aging effects brought about by the presence of water in emeraldine base (EB) polyaniline (PANI) doped with Pd or Pt protonic acids were studied. IR spectroscopy, XRD, XPS and heterogeneous catalytic hydrogenation (alkyne→alkene→alkane) were applied to characterise the PANI–Pd and PANI–Pt. Interpretation of the results gave the surface characteristics, structure, chemical catalytic activity and stability mainly of PANI–Pd specimens. The unique form of catalytically active centres therein was the surface complex [PdCl4]2− with Pd 3d5/2 BE=337·7 eV. The most promising among the PANI–Pd catalysts studied were those dried in a slow, long procedure (3 months, zeolite 5A). Copyright © 1998 John Wiley & Sons, Ltd.